Starting From Seed Questions

Hi, question about starting from seeds. All germinated and sprouting with roots, plants are about 7" high and looking good, just got 3rd set of leafs.

I have them in grodan starter mini-blocks, sitting on a bed of perelite with a dome over them under 24 hr flos. No bugs pretty clean env.

question is, how often should they be watered?
Should the perelite be changed and how often?

Putting them under a 400 hid in 2 to 3 weeks, but want to make sure everything i do now is correct. I have not feed them anything as of yet, should I? All are going in an 3'x3' ebb&flo system

thanks!

I would start out with 100-200ppm. next week try to raise it to 400ppm. Check for burns before you go farther. Rockwool holds lots of water. What I do is pick the cube up and weigh it with my hand. If it feels light then water. When you start the ebb and flow you prolly wont need to water every day at first. Rockwool is real easy to overwater. So make sure its dry. Most likely you will need to manualy water since timers are usually daily. As for the perlite, I would just get rid of it all together.